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对我国常用沥青混合料进行对比,发现在压实后其空隙率远高于设计值,使刚建成的沥青路面存在透水的风险,从而引起路面水损坏的发生。提出了沥青混合料空隙层次模型,并通过不同空气压力下沥青混合料的透水性能试验进行验证,结果表明:上述模型是合理的,常压下沥青混凝土的吸水率要小于其空隙率,而正压下的吸水率与常压吸水率基本相同;交替压力下的吸水率与真空吸水率相似,均高于常压吸水率,说明真空压力是促使沥青混凝土吸水的主要原因。
Comparing the commonly used bituminous mixtures in our country, we find that the porosity of the asphalt pavement is much higher than the designed value after compaction, causing the risk of water permeation in the newly built asphalt pavement, causing the water damage of the pavement. The air gap gradation model of asphalt mixture was proposed and verified by the permeability test of asphalt mixture under different air pressures. The results show that the above model is reasonable and the water absorption of asphalt concrete under normal pressure is smaller than that of asphalt mixture, The water absorption under pressure is basically the same as that under atmospheric pressure. The water absorption under alternating pressure is similar to that under vacuum water pressure, which is higher than the water absorption at atmospheric pressure, indicating that the vacuum pressure is the main reason to promote the water absorption of asphalt concrete.